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https://github.com/c64scene-ar/llvm-6502.git
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af23f8e403
memory intrinsics in the SDAG builder. When alignment is zero, the lang ref says that *no* alignment assumptions can be made. This is the exact opposite of the internal API contracts of the DAG where alignment 0 indicates that the alignment can be made to be anything desired. There is another, more explicit alignment that is better suited for the role of "no alignment at all": an alignment of 1. Map the intrinsic alignment to this early so that we don't end up generating aligned DAGs. It is really terrifying that we've never seen this before, but we suddenly started generating a large number of alignment 0 memcpys due to the new code to do memcpy-based copying of POD class members. That patch contains a bug that rounds bitfield alignments down when they are the first field. This can in turn produce zero alignments. This fixes weird crashes I've seen in library users of LLVM on 32-bit hosts, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176022 91177308-0d34-0410-b5e6-96231b3b80d8
121 lines
3.1 KiB
LLVM
121 lines
3.1 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=core2 | FileCheck %s -check-prefix=LINUX
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; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=core2 | FileCheck %s -check-prefix=DARWIN
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
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; Variable memcpy's should lower to calls.
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define i8* @test1(i8* %a, i8* %b, i64 %n) nounwind {
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entry:
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tail call void @llvm.memcpy.p0i8.p0i8.i64( i8* %a, i8* %b, i64 %n, i32 1, i1 0 )
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ret i8* %a
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; LINUX: test1:
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; LINUX: memcpy
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}
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; Variable memcpy's should lower to calls.
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define i8* @test2(i64* %a, i64* %b, i64 %n) nounwind {
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entry:
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%tmp14 = bitcast i64* %a to i8*
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%tmp25 = bitcast i64* %b to i8*
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp14, i8* %tmp25, i64 %n, i32 8, i1 0 )
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ret i8* %tmp14
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; LINUX: test2:
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; LINUX: memcpy
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}
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; Large constant memcpy's should lower to a call when optimizing for size.
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; PR6623
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; On the other hand, Darwin's definition of -Os is optimizing for size without
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; hurting performance so it should just ignore optsize when expanding memcpy.
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; rdar://8821501
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define void @test3(i8* nocapture %A, i8* nocapture %B) nounwind optsize noredzone {
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entry:
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 64, i32 1, i1 false)
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ret void
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; LINUX: test3:
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; LINUX: memcpy
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; DARWIN: test3:
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; DARWIN-NOT: memcpy
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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; DARWIN: movq
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}
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; Large constant memcpy's should be inlined when not optimizing for size.
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define void @test4(i8* nocapture %A, i8* nocapture %B) nounwind noredzone {
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entry:
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 64, i32 1, i1 false)
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ret void
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; LINUX: test4:
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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}
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@.str = private unnamed_addr constant [30 x i8] c"\00aaaaaaaaaaaaaaaaaaaaaaaaaaaa\00", align 1
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define void @test5(i8* nocapture %C) nounwind uwtable ssp {
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entry:
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %C, i8* getelementptr inbounds ([30 x i8]* @.str, i64 0, i64 0), i64 16, i32 1, i1 false)
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ret void
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; DARWIN: test5:
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; DARWIN: movabsq $7016996765293437281
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; DARWIN: movabsq $7016996765293437184
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}
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; PR14896
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@.str2 = private unnamed_addr constant [2 x i8] c"x\00", align 1
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define void @test6() nounwind uwtable {
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entry:
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; DARWIN: test6
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; DARWIN: movw $0, 8
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; DARWIN: movq $120, 0
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* null, i8* getelementptr inbounds ([2 x i8]* @.str2, i64 0, i64 0), i64 10, i32 1, i1 false)
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ret void
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}
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define void @PR15348(i8* %a, i8* %b) {
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; Ensure that alignment of '0' in an @llvm.memcpy intrinsic results in
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; unaligned loads and stores.
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; LINUX: PR15348
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; LINUX: movb
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; LINUX: movb
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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; LINUX: movq
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a, i8* %b, i64 17, i32 0, i1 false)
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ret void
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}
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